Noise Texture does not work with my mesh
Hello I was just googling the same issue with donut turning up pink and posted about it here and someone very wise informed me Material previews are only in EEVEE and not Cycles: https://www.reddit.com/r/blenderhelp/comments/mne2lf/displacement_bumps_not_displaying_properly_while/
I notice you might have the same problem as me - change your top right Viewport shading from Material Preview to Rendered. That is what Andrew had in his tutorial and I simply overlooked it.
it solved the issue for me, hopefully for you too!